[Eridanus nearly leaps to the side of both girls when Riley trips, though he's stopped only by the fact that his daughter falls right into the arms of her friend. He watches them, silent for a moment, observant of the stranger who seems to be lending her company to Riley. She's tense, that much is obviously—tight shoulders and a darting gaze—she isn't used to strangers, either.

But his focus remains steadfast on sweeping towards them, and dropping down to kneel beside Riley and assist in untangling her. Once freed, Eridanus pulls her into his arms, embracing her tightly.]

I am here, Sunshine. Everything will be alright... I won't let him hurt you. [He sighs the words into her feathered hair, concerned for the loss in their mass, though he won't comment on it for now. And then, his gaze turns upward, towards Mukuro. Though he doesn't look suspicious of her, his eyes are sharp, as if it were the silent stand off between two predator animals.]

Who is your friend? [He asks, voice low, gaze unwavering,] thank you for looking after my daughter, Miss.